"Matthew D. Fuller" <fullermd_at_over-yonder.net> wrote: > On Tue, May 18, 2004 at 08:14:04AM +0200 I heard the voice of > Christian Hiris, and lo! it spake thus: > > > > As far as i know MX records _must_ have an A record. > > RFC1035 states: > MX records cause type A additional section processing for the host > specified by EXCHANGE. The use of MX RRs is explained in detail > in [RFC-974]. > > RFC974 says: > There is one other special case. If the response contains an > answer which is a CNAME RR, it indicates that REMOTE is actually > an alias for some other domain name. The query should be repeated > with the canonical domain name. > > RFC2821 obsoletes 974, but says substantially the same in regards to > CNAME's. So, by the RFC's it's allowed. > > > For me, I think it's a bad practice. But, hey... not necesserally, an mx could point to a cname which is an rr record :) which could explain why this is allowed. google search : bind "in mx" http://www.zytrax.com/books/dns/ch8/mx.html http://www.zytrax.com/books/dns/ch9/rr.html Cyrille Lefevre. -- home: mailto:cyrille.lefevre_at_laposte.netReceived on Mon May 17 2004 - 22:41:27 UTC
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